An inquest later found he had died from "cardio-respiratory arrest in a man intoxicated by synthetic cathinones causing acute disturbance following restraint and struggle against restraint".

The IPCC recommended that Temporary Inspector Justin French, who was on duty at Yeovil police station at the time, should face disciplinary proceedings but earlier this month a misconduct panel dismissed allegations he had lied at Mr Herbert's inquest.

The Crown Prosecution Service decided no criminal charges would be brought against any police officer or the Avon and Somerset force in connection with Mr Herbert's death or the evidence given at the inquest.